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COMEDK2013PhysicsWaves and Sound

Sound waves in air are always longitudinal because

Options

  1. Aof the inherent characteristics of sound waves in air
  2. Bair does not have a modulus of rigidity
  3. Cair is a mixture of several gases
  4. Ddensity of air is very small

Correct answer

B. air does not have a modulus of rigidity

Step-by-step solution

Longitudinal waves in air travels in the form as compression and rarefaction that changes its elastic properties. The air is a completely elastic medium, which does not have a modulus of rigidity. So, sound waves travel in it as a longitudinal wave.

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